Dental casting apparatus



' w. E. SATTLER DENTAL CASTING APPARATUS Flled Aug. 2 1922 Wee. i8 1923.

' 27 g um IIIHIH w i Swoemtoz Patented 18,

WALTER E. SA'ITLER, 031" NEW YORK, N. Y.

Application filed Au ust 2, 1922.

To all whomit may concern:

Be it known that l, amra it. Sarrann, a citizen of the United States,and a resident of New York city, in the county of Bronx and State of NewYork, have invented certain new and useful Improvements in DentalCasting Apparatus, of which the following is a specification.

This invention relates to dental casting machines in which inlayfillings, crowns, bridges, plates and like parts are formed by castingin molds made of plastic material when set or in a rigid condition, bypouring molten metal and subjecting the same to air under pressure.

The principal object of the invention is to provide a selfcontainedapparatus, partaking of the nature of a hand operated press, and inwhich the air pressure is automatically utilized at the proper momentand the air cut off upon release of the main actuating lever.

A further purpose is to provide an apparatus, simple in construction,effective in operation. not readily liable to become deranged and whichcan be produced at a moderate expense.

These and other similar objects, aims and purposes are attained by thenovel construc tion, combination and arrangement of parts hereinafterdescribed and shown in the accompanying drawing, forming a material partof this disclosure, and in which Figure 1 is a side clevational view ofa casting machine made in accordance with the invention, illustratingits application and showing by broken lines the movable parts in theirlowered position.

Figure 2 is an enlarged sectional view taken through the base of thesame showing the automatic valve arrangement.

In the embodiment of the machine shown, the numeral 10 designates theplatform or sub-base, on an extension of which may be mounted an airreservoir, pump and gauge as usual, these parts being of common type,and being no part of the invention are not shown.

Supported by spacers 11 from the platform is a level base plate 12 fromwhich rises a rigid standard 13 having forwardly extending arms 1 1 and15 bored to slidably receive a plunger rod 16 having a knob 17 at itsupper end and being connected at its lower'end with a head 18.

Pivoted to the side of the standard 18 is Serial No. 578,142.

a link 19 in turn pivoted to the arm 20 of a bell-crank lever having anupstanding manually operable handle or arm this lever being pivoted at23 to the rod 16, the position of the several pivots and proportion ofthe link and lever being such that the handle 22 will hold the plungerwhen raised to contact with the stop pin 21 and also ailord a powerfulaction when operated.

The plunger head 18 contains an annular recess 24 and at the centerthereof is an opening 25 into which the inlet 26 leads. this inlet beingfixed in the hub of the head 18.

In axial alinement with the plunger is a disc 27 having a raisedmarginal band 28 and provided with a hub 29 on its lower side, saidCllSc having a plurality of perforations 30 as hereafter described.

The hub 29 contains an annular recess 31 movably fitting the extension32 of a plug screw;threaded into the plate 12, against its shoulderedportion Said plug contains a bored opening above the chamber 36, a valveseat 37 and av recess 38 inmiediatcly above the valve seat, into whichleads a transverse passage 39.

A conical valve 10 is fitted to the seat 37, the valve having a stem 11fitting the bore and is secured in the disc 27 by its screwthreaded end4-2.

The lower end of: the chamber 36 is internally threaded to receive thecorresponding threaded end 13 of a cap at covering the chamber 36 andcontains a seat for the lower end of a coiled compression spring 415,the upper end. of which abuts the bottom of the valve 10, maintaining itagainst its seat and holding the disc 27 in a raised position, the hub29 of the disc making contact with the plate 12, acting as a limit stop,when the disc is fully depressed.

Fixed in the wall of the chamber 86 is an air inlet 46 and in verticalregister thereabove is a similar fitting 4L7 communicating with thepassage 39 leading to the recess above the valve.

Attached to the inlet 46 is a flexible tube 18 leading to a supply ofcompressed air, and engaged with the fitting 17 is another flexible tubea9 attached at its other end to the inlet fitting 26.

It will now be understood that when a flask 50 containing a mold, beplaced on the disc 27 and the lever handle 22 be drawn down, the plungerhead will enter the flask and when sufficient pressure has been exerted,the disc will be forced down, opening the valve 40, allowing thecompressed air entering the chamber 36 to pass into the recess 38, outof the fitting 4L7, through the tube 49 into the head 18 andthcnce intothe mold.

It will be equally apparent that when the pressure is relaxed the spring4E5 will raise the disc and close the valve, shutting off the airautomatically, avoiding waste of air, time and attention on part of theoperator and materially facilitating the casting operation.

Although I have described my improvements with considerable detail andwith respect to certain particular forms of my invention, I do notdesire to be limited to such details since many changes andmodifications may be made without departing from the spirit and scope ofmy invention in its broadest aspect.

Having thus described my invention, what- I claimas new and desire tosecure by Letters Patent, is

1. A casting apparatus comprising abase,

a platform spaced thereabove, a column .fixed on said bottom, a plugfixed in said platform to extend downward into said base and having anextending upper end, a plate having a hub slidable on the extending endof said plug, said plate being receptive ot a flask, a plunger carriedby said column, a bell-crank lever pivoted thereto engaging saidplunger, and a single link combined with said lever for holding theplunger when in a raised position. v

2. A casting apparatus comprising a platform, a column fixed thereon, aplate rcceptive of a flask, said plate being vertically movable withreference to said platform, a

spring normally holding 7 said plate in a raised position, a plungeroperable vertically in alinement with said plate, and means for automatially conducting. compressed air from below said plate directly to theplunger when the latter is depressed. V

3. A casting apparatus comprising a platform, a plate spaced above saidplatform, a

disc vertically slidable over said plate, a

chamber below said plate, a valve in said. chamber, an inlet to saidchamber, an outlet above said valve, a plunger, a single tubularconnection from said outlet to said plunger and means for automaticallyopening said valve upon the depression of said plunger.

4-. A casting apparatus comprising in combination with a flask and asource of air under compression, of means for resiliently supporting theflask, a plunger operative with respect to the flask, a chamber belowsaid flask support, said chamber being in an outlet above said valve, amanually op".

orable plung 'cr fitted to said flask, and single flexible airconnections from said outlet to said plunger.

in testimony whereof I have signed my name to this application.

WALTER n. sarrnnnj

